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Thread: Uk talktalk zoom x5 router mtu problems

  1. #1
    Junior Member
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    Jun 2007
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    Uk talktalk zoom x5 router mtu problems

    Hi,i cant get the mtu settings to display properly in tcpip anylyzer here is the report
    SpeedGuide.net TCP Analyzer Results
    Tested on: 06.08.2007 12:15
    IP address: 84.13.xxx.xxx

    TCP options string: 020405280103030301010402
    MSS: 1320
    MTU: 1360
    TCP Window: 522240 (NOT multiple of MSS)
    RWIN Scaling: 3
    Unscaled RWIN : 65280
    Reccomended RWINs: 63360, 126720, 253440, 506880
    BDP limit (200ms): 20890kbps (2611KBytes/s)
    BDP limit (500ms): 8356kbps (1044KBytes/s)
    MTU Discovery: ON
    TTL: 40
    Timestamps: OFF
    SACKs: ON
    IP ToS: 00000000 (0)

    Im running xp pro fully patched
    zone alarm
    avg free antivirus

    Talktalk has a mtu of 1400 but somewhere the router is blocking the final figure getting through,it detects the mtu as 1400 but as you see regardless of what i change it to it stays at 1360,i have a different router which does show everything, correctly please dont say stick with the other router,i really need the zoom x5 router to work correctly,any help would be appreciated.

  2. #2
    Elite Member trogers's Avatar
    Join Date
    Jan 2005
    Location
    Bangkok, Thailand
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    12,323
    What speed did you pay to get?

    Try the following with TCP Optimizer to find your max. MTU:

    General Settings tab:
    Custom settings - check
    Modify All Network Adapters - check
    network adapter selection - your NIC
    MTU 1500
    TTL - 64
    TCP Receive Window - leave blank
    MTU Discovery - Yes
    Black Hole Detect - No
    Selective Acks - Yes
    Max Duplicate ACKs - 2
    TCP 1323 Options:
    Windows Scaling - uncheck
    Timestamps - uncheck

    Advanced Settings tab:
    Max Connections per Server - 10
    Max Connections per 1.0 Server - 20
    LocalPriority - 1
    Host Priority - 1
    DNSPriority - 1
    NetbtPriority - 1
    Lan Browsing speedup - optimized
    QoS: NonBestEffortLimit - 0
    ToS: DisableUserTOSSetting - 0
    ToS: DefaultTOSValue - 80
    MaxNegativeCacheTtl - 0
    NetFailureCacheTime - 0
    NegativeSOACache Time - 0
    LAN Request Buffer Size - 32768
    Then select "Apply Changes" and reboot to take effect

    After reboot, post a new TCP Analyzer report.

  3. #3
    Junior Member
    Join Date
    Jun 2007
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    SpeedGuide.net TCP Analyzer Results
    Tested on: 06.08.2007 18:27
    IP address: 89.241.xx.xxx

    TCP options string: 0204052801010402
    MSS: 1320
    MTU: 1360
    TCP Window: 65535 (NOT multiple of MSS)
    RWIN Scaling: 0
    Unscaled RWIN : 65535
    Reccomended RWINs: 63360, 126720, 253440, 506880
    BDP limit (200ms): 2621kbps (328KBytes/s)
    BDP limit (500ms): 1049kbps (131KBytes/s)
    MTU Discovery: ON
    TTL: 41
    Timestamps: OFF
    SACKs: ON
    IP ToS: 01010000 (80)
    Precedence: 010 (immediate)
    Delay: 1 (low delay)
    Throughput: 0 (normal throughput)
    Reliability: 0 (normal reliability)
    Cost: 0 (normal cost)
    Check bit: 0 (correct)
    DiffServ: AF22 010100 (20) - Assured Forwarding class 2, medium drop precedence (RFC 2597).

    I should have a 8mb service,thanks for the reply

  4. #4
    Elite Member trogers's Avatar
    Join Date
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    Location
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    Try the following with TCP Optimizer:

    General Settings tab:
    Custom settings - check
    Modify All Network Adapters - check
    network adapter selection - your NIC
    MTU 1360
    TTL - 64
    TCP Receive Window - 253440
    MTU Discovery - Yes
    Black Hole Detect - No
    Selective Acks - Yes
    Max Duplicate ACKs - 2
    TCP 1323 Options:
    Windows Scaling - checked
    Timestamps - uncheck

    Advanced Settings tab:
    Max Connections per Server - 10
    Max Connections per 1.0 Server - 20
    LocalPriority - 1
    Host Priority - 1
    DNSPriority - 1
    NetbtPriority - 1
    Lan Browsing speedup - optimized
    QoS: NonBestEffortLimit - 0
    ToS: DisableUserTOSSetting - 0
    ToS: DefaultTOSValue - 80
    MaxNegativeCacheTtl - 0
    NetFailureCacheTime - 0
    NegativeSOACache Time - 0
    LAN Request Buffer Size - 32768
    Then select "Apply Changes" and reboot to take effect

    After reboot, test your speed at this link using the recommended test server:

    http://www.speedtest.net/

  5. #5
    Junior Member
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    SpeedGuide.net TCP Analyzer Results
    Tested on: 06.09.2007 08:02
    IP address: 89.241.xx.xxx

    TCP options string: 020405280103030201010402
    MSS: 1320
    MTU: 1360
    TCP Window: 253440 (multiple of MSS)
    RWIN Scaling: 2
    Unscaled RWIN : 63360
    Reccomended RWINs: 63360, 126720, 253440, 506880
    BDP limit (200ms): 10138kbps (1267KBytes/s)
    BDP limit (500ms): 4055kbps (507KBytes/s)
    MTU Discovery: ON
    TTL: 42
    Timestamps: OFF
    SACKs: ON
    IP ToS: 01010000 (80)
    Precedence: 010 (immediate)
    Delay: 1 (low delay)
    Throughput: 0 (normal throughput)
    Reliability: 0 (normal reliability)
    Cost: 0 (normal cost)
    Check bit: 0 (correct)
    DiffServ: AF22 010100 (20) - Assured Forwarding class 2, medium drop precedence (RFC 2597).

    Results are speed 5946 up 378 down latency 62ms
    thanks for your reply

  6. #6
    Elite Member trogers's Avatar
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    It will be difficult to attain 90% of your 8 mbps due to a somewhat low MTU.

  7. #7
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    many thanks but as u gather its down to the router,nothing else can cause probs,dlink dsl504t uk version flashed with aussie firmware works better than than zoom.will stick with the link its about 28% faster with downloads and download corruption,many thankx for your help,if i get it sorted i will post results.

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